Experimental Physics and
Industrial Control System

Ned Arnold <[email protected]> · Mon, 14 Feb 2000 08:06:33 -0600 (CST)

> I am trying to understand details of the calcout record.
> As distributed it does not appear to have any devise support including
> "Soft Channel". I added a devise support entry table in the usual way
> and added the following to the appropriate dbd file:
> device(calcout,CONSTANT,devCalcoutSoft,"Soft Channel")
> 
> This works fine except nothing in my entry table ever gets called.
> All it seems to require is the "Soft Channel" entry.
> 
> What I am really trying to do in the long run is add device support.
> Is this possible?
> 
> Thanks
> Graham.

Yes, it's possible, but you will have to add the call to device support in the
process() routine of the calcout record. Calling device support is not
"automatic" during record processing, for it is up to the record support
as to when this is actually done during the processing.

Examples abound in base distribution (src/rec) ... look for any code that 
uses "pdset->", such as the following ...

    if(!(pdset = (struct aodset *)(pao->dset))) {
        recGblRecordError(S_dev_noDSET,(void *)pao,"ao: init_record");
        return(S_dev_noDSET);
    }
    /* get the initial value if dol is a constant*/
    if (pao->dol.type == CONSTANT) {
        if(recGblInitConstantLink(&pao->dol,DBF_DOUBLE,&pao->val))
            pao->udf = FALSE;
    }

    /* must have write_ao function defined */
    if ((pdset->number < 6) || (pdset->write_ao ==NULL)) {
        recGblRecordError(S_dev_missingSup,(void *)pao,"ao: init_record");
        return(S_dev_missingSup);
    }
    pao->init = TRUE;
    pao->eoff = pao->egul;

    if (pdset->init_record) {
        status=(*pdset->init_record)(pao);
        switch(status){

If you make such substantial changes to an existing record type, please
rename the record type. This way the original author will not get support
requests about the new features :).

	Ned

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System